Female fireflies fake another species' mating flash, then eat the males who fall for it

Male fireflies flash a species-specific pattern of light to attract mates, and females answer with the matching pattern. Predatory Photuris fireflies mimic the answering flash of other species, luring in hopeful males of a completely different genus — then eating them. Scientists call the predators 'femmes fatales'; the behaviour also lets them steal defensive toxins from their prey to protect their own eggs.

— James E. Lloyd, Aggressive Mimicry in Photuris: Firefly Femmes Fatales — Science, 1965